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The Development of High-precision Gas-sensor Properties Testing System

Author: WangGuanNan
Tutor: ZhaoChun
School: Jilin University
Course: Circuits and Systems
Keywords: Gas Sensing Properties Simulated test environment Small DC signal The large dynamic range of detection Capacitive buttons control
CLC: TP212
Type: Master's thesis
Year: 2010
Downloads: 106
Quote: 0
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Abstract


With the development of China's development of gas sensor technology, its self-developed gas sensing characteristics of the test system did not keep up with the pace of development of the gas sensor developed technology, the paper draws on the market today, and research institutions for laboratory use gas sensing properties test system based on a combination of the latest data collection technology, as well as a novel capacitive button controls and portable instruments design concept, the formation of a high-precision gas sensing characteristics of the test system. System applied to small high-precision multi-channel the DC signal acquisition technology, multi-channel testing, and on this basis to achieve a high simulation test environment simulation, portability and capacitive buttons control. Meet the testing needs of the vast majority of enterprises and research institutions on the gas sensing characteristics, and the settings can be personalized according to their specific applications. Total simulation of the entire test system test environment, data acquisition hardware circuit and the capacitive button control system is composed of three parts, the simulation test environment test environment simulation gas tank with heating, temperature control hardware circuit has more precise temperature control of heating capacity, and by improving the industrial design of the gas tank to have good cooling capacity, you can shorten the test cycle, improve the accuracy of laboratory testing for gas sensors, and save the test of time. Data acquisition hardware circuit to achieve a constant voltage source collection of high-precision micro DC signal is divided into the high accuracy tiny the DC signal acquisition system, the two parts of the analog-to-digital conversion system. The high-precision micro DC signal acquisition system can automatically shift to achieve the large dynamic range of detection, the the relative For general amplification system can achieve the rapid automatic shift and high-precision detection, data acquisition system can achieve rapid conversion of the multi-channel, in maintain a low design cost, to achieve high performance. The entire data acquisition hardware circuit uses a single power supply, portable gas sensing characteristics of the test, and has a capacitive button control system to improve the ease of use and user experience. The above data acquisition hardware circuit the direction of the research paper. The capacitive button control system consists of single-electrode sensor measuring the change in the value of the capacitor. PCB board of the sensor electrode is a piece of metal plate of the virtual capacitor. Another piece of metal plate of the capacitor is the user's finger, and the ground of the sensor input signal. Zero pressure touch design makes the user can get a better experience and unlimited use, has a great advantage compared to the traditional mechanical buttons control.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor
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